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Field Ion microscope studies on guinier-preston zones in Aluminium alloys

✍ Scribed by Prof. Dr. K. Hirano

Publisher
John Wiley and Sons
Year
1984
Tongue
English
Weight
544 KB
Volume
19
Category
Article
ISSN
0232-1300

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✦ Synopsis

Since the discovery of age-hardening phenotnenon in aluminium alloys iiiany works have been carried out to elucidate inechanism of the precipitation processes and i t has been shown that the clustering of solute atoms on the matrix lattice or formation of the G.P. zones is the most important process in the age-hardening. Based on X-ray analysis and trarismission electron microscopy, it has been shown that the precipitation process in a supersaturated solid solution of A1-1.7 at.% Cu alloy is solid solution -+ G.1'. (I) zones --+ G.1'. ( ) zonest intermediate precipitate 8' --+ equilibrium precipitate 8. However, concerning detailed atoiriic arrangement in the G.P. zones, shape of the zones

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is proportional to the intercept divided by the sixth power of the radius. It may be noted that use of this graphical analysis of the X-ray scattering data lectds to a much better agreement between the two difIerent methods of cluster size determination. The sizes of the two fractions obtained by

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of the equilibrium a and y mixtures produced by long annealing at 400Β°C. It can be seen that the peaks resulting from the mergers in the tempered martensite pattern have roughly the same angular position as those in the pattern from cold-worked filings; i.e. peaks 3 and 4 approach the position of th